BBmg malfunction

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im currently using the general design of nighthawkinflights bbmg here

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but i have a paintball tank variable of an output from 0-300 psi ive been using a blowgun valve but its limit is 80 psi .are there other small easy to release valves?

p.s.im working on a bolt action rifle but i cant get the bbs to stay in the 6mm barrel how should i fix this ?
p.s.s can a qev work in this rifle situation

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I've used blowguns up to 450 psi without problems, most of them can take the pressure - the problem is that they get more difficult to open the higher you go.

im working on a bolt action rifle but i cant get the bbs to stay in the 6mm barrel how should i fix this ?

Various options available.

You could sandwich an o-ring in a compression fitting:



You could also drill a hole for a small ball and hold it in place with some sort of spring:

can a qev work in this rifle situation

Yes, it is a cheap and effective valve for a small bore rifle, and can be combined with a three way valve pilot if multiple shots are required.

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how does the trigger system work in the qev 3way pilot valve setup,im out of my area of experience since i do simple pheumatic cannons

i need th air to burst out since it will be a high powered aisoft rifle but i am unsure of a magazine or loading system.i would like this to be semi auto but the main question is aiming